Stripper formulations and process

Abstract

Improved stripper formulations for use on metal cross linked floor finishes comprise a compound selected from the group consisting of a chelant containing an amine functionality and a metal chelating ligand, an alkali metal salt of the chelant, an aliphatic or aromatic polyamine, the aromatic polyamine having the amine functionality outside the aromatic ring, and mixtures of the chelant and polyamine. The stripper formulations are applied to metal cross linked floor finishes in a process for stripping such finishes.

Description

BACKGROUND OF THE INVENTION

This invention relates to stripper formulations and, more particularly, to improved stripper formulations for use on metal cross linked floor finishes.

Stripper formulations currently in use on metal cross linked floor finishes typically are highly alkaline due to the presence of caustic and/or monoethanol amine (MEA) used to break the metal cross link bond. Once the metal cross link is disrupted, solvency can then dissolve the polymer contained in the finish and remove the finish from the floor.

There remains a need, therefore, for stripper formulations which are more neutral in nature which in turn requires finding another way to break the metal cross link bond more efficiently and without the use of highly alkaline solutions.

SUMMARY OF THE INVENTION

Among the several objects of the invention may be noted the provision of improved stripper formulations for use on metal cross linked floor finishes; the provision of such improved stripper formulations which require a much smaller molar concentration of the active stripper component than normally used for monoethanol amine in currently available stripper formulations; and the provision of such stripper formulations and a process for applying such formulations to metal cross linked floor finishes to remove such finishes from the floor. Other objects and features will be in part apparent and ain part pointed out hereinafter.

Briefly, the present invention is directed to a process for stripping metal cross linked floor finishes which comprises applying thereto a stripper formulation containing a compound selected from the group consisting of a chelant containing an amine functionality and a metal chelating ligand, an alkali metal salt of said chelant, an aliphatic or aromatic polyamine, the aromatic polyamine having the amine functionality in a substitutent outside the aromatic ring, and mixtures of said chelant and polyamine. The invention is also directed to the aforementioned stripper formulations.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In accordance with the present invention, it has now been found that through the use of certain polyamines and chelating agents, stripper formulations may be prepared which provide enhanced stripper performance over monoethanol amine and caustic found in many stripper formulations. As shown by the test data presented hereinafter, the stripper formulations of the present invention not only provide improved stripper performance but permit such improved results while employing a much lower concentration of active ingredient as compared with the normal monoethanol amine concentration found in may strippers.

The improved stripper performance results from using stripper formulations which contain a chelant containing an amine functionality and a metal chelating ligand, an alkali metal salt of such a chelant, an aliphatic or aromatic polyamine, the aromatic polyamine having the amine functionality in a substituent outside the aromatic ring, or mixtures of such a chelant and polyamine. While not being bound by any particular theory, it is believed that the amine functionality present in the above-mentioned chelant or polyamine functions to break the metal cross link in metal cross linked floor finishes. When a chelant is employed, the chelating ligand ties up the freed metal and allows the amine functionality to again break another metal cross link bond. With the metal cross link disrupted by either a chelant or polyamine as stated above, the polymer in the floor finish can then be dissolved and removed from the floor.

Among the chelants containing an amine functionality and a metal chelating ligand which may be used in the practice of the invention may be mentioned ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, triethylenetetramine hexaacetic acid, nitriloacetic acid, iminodisuccinic acid and alkali metal (e.g. sodium or potassium) salts thereof. Other useful chelants will be apparent to those skilled in the art. The use of such chelants in the process of the invention is so efficient that the chelant can be employed at a 30 to 50 times lower molar concentration than normally used for monoethanol amine. Thus, monoethanol amine is typically present in available stripper formulations at a concentration between 10% to 15% by weight or between 0.16 and 0.25 moles. On the other hand, using sodium iminodisuccinate in accordance with the present invention, 5% of a 34% active solution can be used to make an effective stripper formulation, a molar concentration of 0.00504 moles. Using a similar molar amount of monoethanol amine in a stripper formulation results in inferior performance. Thus, a stripper formulation containing 5% sodium iminodisuccinate removed all 7 lines or layers of finish after 99 strokes in a neutral stripper test whereas a formulation containing a similar molar amount of monoethanol amine removed only 2 lines or layers of finish after 200 strokes.

It has also been demonstrated that the use of a chelant having no amine grouping or functionality provides inferior results. Thus, a test comparing a stripper formulation containing Liquid Gluconate 60 (a blend of gluconic acid and sodium gluconate marketed by PMP Fermentation Products, Inc.) and a stripper formulation containing the tetrasodium salt of ethylenediamine tetraacetic acid showed that the latter is clearly superior.

Monofunctional amines, whether they be aromatic or aliphatic, do not function effectively in the practice of the present invention. For example, ethanolamine does not function well whereas ethylenediamine functions satisfactorily and performance is futher enhanced with the use of diethylenetriamine. Similarly, monofunctional aromatic amines such as aniline, 2-aminopyridine, 2-aminopyrimidine and 3-aminobenzoic acid, which have the amine functionality outside the aromtic ring, do not function well whereas 2-aminobenzylamine does. Accordingly, aromatic monoamines are excluded from use in the practice of the invention as are aromatic polyamines having the amine functionality or moiety within the aromatic ring.

It has also been found that certain compounds such as anthranillic acid which contain both an amine group and a chelant moiety do not function in the practice of the invention and provide inferior performance to other chelants containing an amine functionality. This is due to the fact that in anthranillic acid, the amino group can resonate with the aromatic ring and carboxylate group thereby greatly reducing the basicity or alkalinity of the nitrogen. Chelants of this type are excluded from the class of chelants intended for use in the practice of the present invention.

Among the aliphatic or aromatic polyamines which may be used in the present invention may be mentioned ethylene diamine, diethylene triamine, triethylenetetramine, tetraethylene pentamine, diethylenetriamine pentaacetic acid and triethylenetetramine hexaacetic acid. Other polyamines for use in the present invention will be apparent to those skilled in the art. If an aromatic polyamine is employed, it must have the amine functionality in a substituent outside the aromatic ring. Tests have demonstrated that such polyamines substantially improve stripper performance over monoethanol amine at very low concentrations. Thus, for example, a test comparing a stripper containing 0.00504 moles monoethanol amine with one containing 0.00504 moles ethylene diamine showed that the former was far inferior to the latter. The preferred polyamines are diethylene triamine and a mixture of diethylene triamine and diethylenetriamine pentaacetic acid.

In accordance with the invention, the use of the aforementioned chelants and polyamines provides enhanced stripper performance over monoethanol amine and caustic found in many stripper formulations. An increase in performance is observed not only in neutral stripper formulations but also in highly alkaline stripper formulations such as that marketed under the trade designation Revelation by Buckeye International, Inc., St. Louis, Mo. Moreover, not only is stripper performance enhanced through the practice of the invention, but such enhancement is achieved using a 50 fold decrease in concentration of the chelant or polyamine as compared with the normal monoethanol amine concentration found in many stripper formulations.

In general, a weight range of from approximately 0.1% to approximately 10% by weight of the chelant or polyamine can be used in the practice of the invention. For example, diethylenetriamine is used at 0.5% by weight for maximum performance and sodium iminodisuccinate (in a 34% active solution) is used at 5% by weight. In both of these instances, the molar amount of diethylenetriamine (MW=103) and sodium iminodisuccinate (MW=337) is nearly equal, being approximately 0.005 moles.

In the examples set forth hereinafter, a solvent is included to dissolve the polymer in the metal cross linked floor finish, a surfactant is included to lower surface tension and aid the solvent in dissolving the polymer, isononanoic acid is included as a coupling agent to help put the solvent into solution and zonyl NF is included as a fluorosurfactant which helps in lowering surface tension and suppressing foaming. As previously indicated, the chelant or polyamine functions to break the zinc or other metal cross-link bond and to dissolve the finish.

In the case of the use of a chelant containing an amine functionality in the practice of the invention, it is believed that the amine functionality breaks the metal cross link of metal cross linked floor finishes while the chelating ligand subsequently ties up the freed metal thereby allowing the amine group to break another metal cross link bond. This process is so efficient that the chelant can be used at a 30 to 50 times lower molar concentration than normally used for monoethanol amine. Typically, MEA is present at between 10% to 15% (0.16 to 0.25 moles) in stripper formulations. In accordance with the present invention, using sodium iminodisuccinate for example as the chelant with an amine functionality, 5% of a 34% active solution (0.00504 moles) can be used to make an effective stripper formulation.

As shown by the test data set forth hereinafter, the use of a chelant with no amine functionality produces stripper formulations which provide inferior results. This is demonstrated by comparing stripper formulations containing Luquid Gluconate 60 in formulation 9-131 with 9-129A and 9-130 which both contain the tetrasodium salt of ethylenediamine tetraacetic acid. Liquid Gluconate 60 is a blend of gluconic acid and sodium gluconate in an aqueous solution having a 60% equivalent of sodium gluconate when neutralized with caustic soda, and is marketed by PMP Fermentation Products, Inc.

The following examples illustrate the practice of the invention.

EXAMPLE 1

The following procedures were used in evaluating the stripper formulations of the invention.

Tile Preparation

A white 12″×12″ vinyl composition tile was coated with a layer of desired finish. In these procedures, the finish employed was that marketed under the trade designation Castleguard by Buckeye International, Inc. of St. Louis, Mo. When the finish had completely dried, a line was drawn across the tile using an M. Grumbacher 6B woodless pencil. This type of pencil is used to draw the line because the finish does not smear the pencil line and the pencil line does not repel the finish.

Another coat of finish was put down, allowed to dry and a second pencil line was drawn across the tile. This process was continued until 8 coats of finish and 7 pencil lines had been put down on the tile.

After the last coat of finish had completely dried, the tile was placed in a 77° C. oven for a period of time, generally 2 to 3 days, to simulate aging. The tiles were then removed from the oven and allowed to cool to room temperature.

Stripper Test Procedures

The prepared tiles were then stripped with various stripper formulations diluted to the desired strength, while also running a control. The stripping was done using a Gardner Washability and Wear Tester using a pad wetted with a predetermined amount of stripper formulation solution.

The cumulative number of stokes to remove each successive pencil line represents the number of strokes required in turn to remove each successive layer of finish and thus provides a relative comparison of stripper formulation performance.

EXAMPLE 2

The following stripper formulations were prepared:

	% Components
Component	9-171A	9-172	9-173	9-174	9-175	9-169	9-170
Soft Water	65.6	65.5	65.4	65.5	65.4	65.05	64.4
Sodium Borate	2.0	2.0	2.0	2.0	2.0	2.0	2.0
Dowanol DPnB	15.0	15.0	15.0	15.0	15.0	15.0	15.0
Dowanol PPh	5.0	5.0	5.0	5.0	5.0	5.0	5.0
Neodol 1-5	3.0	3.0	3.0	3.0	3.0	3.0	3.0
Neodol 1-9	4.0	4.0	4.0	4.0	4.0	4.0	4.0
Diethylene Triamine	0.1	0.2	0.3	0.4	0.5	0.9	1.8
Isononanoic Acid	4.0	4.0	4.0	4.0	4.0	4.0	4.0
50% NaOH	1.0	1.0	1.0	0.8	0.8	0.75	none
Zonyl NF	0.3	0.3	0.3	0.3	0.3	0.3	0.3

The above stripper formulations were evaluated for stripper performance using the procedures of Example 1. The product denoted as Liq. Shovel is a stripper formulation marketed under the trade designation Liquid Shovel by Buckeye International, Inc. of St. Louis, Mo. When an entry such as “80% at 90 strokes” appears, it indicates the degree of removal of the pencil line at 90 strokes.

32 oz/gal	Strokes to Remove Pencil Line
Product	7	6	5	4	3	2	1
Liq. Shovel	28	40	51	61	(78)	75	96
9-171A	29	44	62	70	(93)	86	111
9-172	26	40	56	67	79	84	104
9-173	30	45	56	64	89	106	109
9-174	26	40	52	60	76	85	112
Liq. Shovel	19	29	42	48	(66)	64	96
9-175	22	33	43	53	62	67	88
Liq. Shovel	36	62	83	116	149	149	159
9-169	24	41	45	46	65	69	82
9-170	21	34	47	55	74	85	80%	at 90 strokes

EXAMPLE 3

The following stripper formulations were prepared:

	% Components
Component	9-130	9-129A	10-1	10-2	10-4	10-5	9-155	10-7
Soft Water	58.99	62.05	62.7	64.7	61.95	65.4	61.67	64.7
Na Borate	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0
Dowanol DPnB	15.0	15.0	15.0	15.0	15.0	15.0	15.0	15.0
Dowanol PPh	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0
Neodol 1-5	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0
Neodol 1-9	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0
Na4EDTA Hampene 100S	4.8	2.4	2.0	1.0
Diethylenetriamine
Pentaacetic Acid							2.0	0.5
Na Iminodisuccinate					3.0	1.0
Isononanoic Acid	5.25	5.0	5.0	4.0	4.5	3.5	4.0	4.0
50% NaOH	1.66	1.25	1.0	1.0	1.25	0.8	3.03	1.5
Zonyl NF	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3

In the above formulations, Dowanol DPnB is dipropylene glycol n-butyl either (solvent), Dowanol PPh is 1-phenoxy-2-propanol (solvent), Neodol 1-5 and Neodol 1-9 are linear primary alcohols, Hampene 100S is tetrasodium ethylenediamine tetraacetate, and Zonyl NF is a fluorosurfactant marketed by DuPont.

The above stripper formulations were evaluated for stripper performance using the procedures of Example 1. The product denoted as Liq. Shovel is a stripper formulation marketed under the trade designation Liquid Shovel by Buckeye International, Inc.

32 oz/gal	Strokes to Remove Pencil Line
Product	7	6	5	4	3	2	1
9-130	18	30	38	46	56	67	99.9% at 75
							strokes total
9-129A	16	28	36	46	48	54	72 at 75
							strokes total
10-1	18	31	42	55	59	66	89 at 100
							strokes total
10-2	41	71	95	110	143	172	172 at 175
							strokes total
Liq.	45	56	86	129	131	153	99% at 175
Shovel							strokes total
10-4	51	78	97	153	153	181	99% at 200
							strokes total
10-5	81	132	173	221	238	245	60% at 250
							strokes total
9-155	32	53	69	110	(149)	143	134 at 200
							strokes total
10-7	55	71	130	167	90%	80%	80% at 200
							strokes

The percentages given in the above tables indicate the degree of removal after the indicated number of strokes. The number of strokes set forth in the last column reflects the total number of strokes applied based upon 25 stroke increments.

EXAMPLE 4

The following stripper formulations were prepared:

	% Components
Component	9-180	9-181	9-187	9-185	9-19	9-182	9-184	9-186	9-183
Soft Water	65.298	65.222	65.296	65.217	65.227	65.003	64.927	65.084	64.729
Sodium Borate	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0
Dowanol DPnB	15.0	15.0	15.0	15.0	15.0	15.0	15.0	15.0	15.0
Dowanol PPh	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0
Neodol 1-5	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0
Neodol 1-9	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0
Pyridine	0.402
2-Aminopyridine		0.478
Pyrimidine			0.404
2-Aminopyrimidine				0.483
Anline					0.473
3-Aminobenzoic Acid						0.697
3,5-Diaminobenzoic Acid							0.773
2-Aminobenzyl Amine								0.616
Nitrilotriacetic Acid									0.971
Isononanoic Acid	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0
50% NaOH	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	2.25
Zonyl NF	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3

The above stripper formulations were evaluated for stripper performance using the procedures of Example 1.

32 oz/gal	Strokes to Remove Pencil Line
Product	7	6	5	4	3	2	1
Liq.	36	54	71	97	114	132	161
Shovel
9-152	31	49	55	81	89	98	109
9-179	112	—	—	—	—	—	—	Aniline,
								200 strokes
9-180	—	—	—	—	—	—	—	Pyridine,
								200 strokes
9-181	—	—	—	—	—	—	—	2-Aminopyridine,
								200 strokes
Liq.	29	39	55	70	72	79	112	125 strokes total
Shovel
9-152	16	35	42	52	(46)	61	79	100 strokes total
9-182	67	99%	50%	50%	99%	5%	10%	3-Aminobenzoic
								Acid, 200 strokes
9-183	14	26	34	40	43	53	70	75 strokes total
9-184	63	135	50%	40%	10%	—	5%	3,5-Diaminobenzoic
								Acid, 200 strokes
9-145	21	32	40	51	64	69	85	100 strokes total
9-152	13	25	30	40	44	52	56	75 strokes total
9-185	51	89	132	173	99%	191	99	% 2-Aminopyrimidine,
								200 strokes total
9-186	27	38	47	56	65	70	84	2-Aminobenzyl Amine,
								100 strokes total
9-187	54	99	162	(159)	169	186	187	Pyrimidine,
								200 strokes total
With products 9-179, 9-180, 9-181, there was no removal of pencil lines at 200 strokes as indicated.

In some instances, pencil lines 4, 3, 2 and 1 required fewer strokes than pencil line 5 due to the way the layers were formed in preparing the tiles.

EXAMPLE 5

The following stripper formulations were prepared:

	Components	9-150	10-10	10-10A
	Soft Water	67.225	66.5485	62.5485
	MEA	0.31	1.0	5.0
	Dowanol DPnB	20.0	20.0	20.0
	BzOH	3.0	3.0	3.0
	Rose Floral	0.15	0.15	0.15
	DDBSA	2.0	2.0	2.0
	45% KOH	3.0	3.0	3.0
	Isononanoic Acid	4.0	4.0	4.0
	Zonyl NF	0.3	0.3	0.3
	Red S-438	0.0015	0.0015	0.0015

Revelation, a stripper formulation marketed under that trade designation by Buckeye International, Inc., St. Louis, Mo., was also prepared. In the above table, B_zOH is benzyl alcohol and MEA is monoethanol amine.

The above stripper formulations were evaluated for stripper performance using the procedures of Example 1.

32 oz/gal	Strokes to Remove Pencil Line
Product	7	6	5	4	3	2	1
Revelation	14	23	31	32	32	32	33	15.0% MEA, 40 strokes
9-150	182	5%	—	—	—	—	—	0.31% MEA, 200 strokes
10-10	91	107	117	104	108	106	120	1.0% MEA, 125 strokes
10-10A	48	62	64	63	70	70	73	5% MEA, 75 strokes
9-157A	17	24	34	37	43	46	49	0.9% Diethylene triamine, 50 strokes

The product “9-157A” is similar to products 9-150, 10-10 and 10-10A, but contains 0.9% by weight diethylene triamine instead of MEA.

EXAMPLE 6

The following stripper formulations were prepared:

	Components	10-15	10-11	11-14
	Soft Water	64.7	62.61	59.2
	Na Borate	2.0	2.0	2.0
	Dowanol DPnB	15.0	15.0	15.0
	Dowanol PPh	5.0	5.0	5.0
	Neodol 1-5	3.0	3.0	3.0
	Neodol 1-9	4.0	4.0	4.0
	Na Iminodisuccinate	—	—	—
	Diethylene Triamine	0.5	0.5	0.5
	Diethylenetriamine	0.5	1.0	2.0
	Pentaacetic Acid
	Isononanoic Acid	4.0	4.5	6.5
	50% NaOH	1.0	1.75	2.5
	Zonyl NF	0.3	0.3	0.3

The above stripper formulations were evaluated for stripper performance using the procedures of Example 1.

32 oz/gal	Strokes to Remove Pencil Line
Product	7	6	5	4	3	2	1
Liquid Shovel	34	44	64	77	104	121	136
10-15	12	27	33	40	45	57	65
10-11	11	20	28	37	40	49	56
10-14	14	27	37	42	52	64	75
Revelation	25	35	38	41	45	45	45

EXAMPLE 7

Stripper formulations similar to those set forth in Example 2 were prepared and contained 0.00504 moles of the amine or chelant specified below in lieu of sodium iminodisuccinate (0.00504 moles) which is present in the stripper product sold under the trade designation Liquid Shovel by Buckeye International, Inc.

Formulation Amine or Chelant
9-129A      Hampene 100S
9-130       0.01 moles Hampene 100S
9-131       Liquid Gluconate 60
9-133       Anthranillic acid
9-134       Monoethanol amine
9-135       Iminodiacetic acid
9-145       Ethylene diamine
9-152       Diethylene triamine
9-152A      Triethylenetetramine
9-153       Tetraethylene Pentamine
9-155       Diethylenetriamine pentaacetic acid
9-156       Triethylenetetramine hexaacetic acid

These formulations were evaluated for stripper performance using the procedures of Example 1 with the following results:

32 oz/gal
Product	7	6	5	4	3	2	1
	Stripper Tests Strokes to
	Remove Pencil Line
9-145	32	46	78	90	106	116	99%
9-152	19	31	48	54	60	70	85
9-152A	32	46	61	78	91	106	119
9-145	77	138	169	—	—	—	—
9-152	36	59	68	116	147	145	138
9-155	28	39	54	77	108	110	98
9-156	27	43	47	61	88	104	106
	Stripper Tests - Tile G-179 Strokes
	to Remove Pencil Line
9-129A	26	44	55	67	90	94	107
9-130	22	36	40	56	74	85	91
9-131	134	99% after 200 strokes
9-133	178	75% after 200 strokes
	Stripper Tests - Tile G-180 Strokes
	to Remove Pencil Line
9-134	78	131	90% after 200 strokes
9-135	25	34	44	56	67	81	103
9-145	31	50	63	82	117	112	85% after
							125 strokes

EXAMPLE 8

Stripper formulations similar to those set forth in Example 2 were prepared and contained 0.00504 moles of the amines listed below in lieu of monoethanolamine (15% or 0.246 moles/100 grams) which is present in the stripper product sold under the trade designation Revelation by Buckeye International, Inc.

Formulation Amine
9-150       Monoethanolamine (0.00504 moles)
9-151       Ethylene diamine
9-157       Diethylene triamine
9-157A      0.009 moles Diethylene triamine
9-161       Sodium iminodisuccinate
9-162       Hampene 100S

These formulations were evaluated for stripper performance using the procedures of Example 1 with the following results:

	32 oz/gal	Strokes to Remove Pencil Line
	Product	7	6	5	4	3	2	1
	Revelation	16	27	32	34	34	32	34
	9-150	142	—	—	—	—	—	—
	9-151	34	53	71	84	85	94	91
	9-157	11	20	29	33	37	40	54
	9-157A	12	19	26	29	33	38	35
	Revelation	18	28	30	30	30	31	27
	9-161	16	32	36	49	55	67	79
	9-162	26	36	50	64	77	93	117
	9-157	16	29	36	39	54	58	67
	9-157A	15	27	29	33	39	45	46

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As various changes could be made in the above methods and compositions without departing from the scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims

1. A process for stripping metal cross linked floor finishes which comprises applying thereto a stripper formulation containing a compound selected from the group consisting of a chelant containing an amine functionality and a metal chelating ligand, an alkali metal salt of said chelant, an aliphatic or aromatic polyamine, said aromatic polyamine having the amine functionality in a substituent outside the aromatic ring, and mixtures of said chelant and polyamine.

2. A process as set forth in claim 1 wherein said chelant is selected from the group consisting of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, triethylenetetramine hexaacetic acid, nitriloacetic acid, iminodisuccinic acid, and alkali metal salts thereof.

3. A process as set forth in claim 2 wherein said chelant is tetrasodium ethylenediamine tetraacetate.

4. A process as set forth in claim 2 wherein said chelant is sodium iminodisuccinate.

5. A process as set forth in claim 2 wherein said chelant is diethylenetriamine pentaacetic acid.

6. A process as set forth in claim 1 wherein said polyamine is selected from the group consisting of ethylene diamine, diethylene triamine, triethylene tetramine and tetraethylene pentamine.

7. A process as set forth in claim 1 wherein said polyamine is diethylene triamine.

8. A process as set forth in claim 1 wherein said stripper formulation contains a mixture of diethylene triamine and diethylenetriamine pentaacetic acid.

9. A process as set forth in claim 1 wherein said stripper formulation contains approximately 0.1% to approximately 10% by weight of said compound.

10. A process as set forth in claim 1 wherein said stripper formulation contains approximately 0.5% by weight of diethylene triamine.

11. In a process for stripping metal cross-linked floor finishes by applying thereto a stripper formulation, the improvement which comprises incorporating in said stripper formulation a compound selected from the group consisting of a chelant containing an amine functionality and a metal chelating ligand, an alkali metal salt of said chelant, an aliphatic or aromatic polyamine, said aromatic polyamine having the amine functionality in a substituent outside the aromatic ring, and mixtures of said chelant and polyamine.

12. A process as set forth in claim 11 wherein said chelant is selected from the group consisting of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, triethylenetetramine hexaacetic acid, nitriloacetic acid, iminodisuccinic acid, and alkali metal salts thereof.

13. A process as set forth in claim 12 wherein said chelant is tetrasodium ethylened iamine tetraacetate.

14. A process as set forth in claim 12 wherein said chelant is sodium iminodisuccinate.

15. A process as set forth in claim 12 wherein said chelant is diethylenetriamine pentaacetic acid.

16. A process as set forth in claim 11 wherein said polyamine is selected from the group consisting of ethylene diamine, diethylene triamine, triethylene tetramine and tetraethylene pentamine.

17. A process as set forth in claim 11 wherein said polyamine is diethylene triamine.

18. A process as set forth in claim 11 wherein said stripper formulation contains a mixture of diethylene triamine and diethylenetriamine pentaacetic acid.

19. A process as set forth in claim 11 wherein said stripper formulation contains approximately 0.1% to approximately 10% by weight of said compound.

20. A process as set forth in claim 11 wherein said stripper formulation contains approximately 0.5% by weight of diethylene triamine.